JPH06218479A - Method and device for forming surface of metal material - Google Patents

Abstract

PURPOSE:To easily enable flattening and up-set forming, etc., of build-up welded metal material with high efficiency by executing the build-up welding on a base material surface with the metal material consisting of a metal, alloy or metal base composite, locally heating and press-forming the build-up welded metal material. CONSTITUTION:The build-up welding is executed on the surface of the base material (e.g. S45C steel) 2 having a groove part 1 by a coated electrode for hardening build-up welding. The prescribed position in the hardening build-up welding part 3 is locally heated at the prescribed temp. (>=1000 deg.C) by using the means such as oxygen-acetylene burner, laser beam, and high frequency induction heating. After reaching to the prescribed temp., immediately this position is pressed with a pressurizing jig 4 and the up-set forming by coming the build-up welding part 3 is executed and thereafter, finish-grinding is executed. By this method, even in the case of the hardened material, the extremely efficient formation can be obtd. and the prescribed formation is precisely performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface forming method for a metal material and a surface forming apparatus therefor. More specifically, the present invention relates to a new metal surface forming method and a device therefor, which is made of a high-hardness material that is difficult to be cut, and which enables overlay flattening at a predetermined portion or upset forming.

[0002]

2. Description of the Related Art Conventionally, it has been often practiced to build up a predetermined portion on the surface of a base material and flatten this to form a predetermined shape. In this case, in many cases, a method of cutting and polishing after overlay welding has been adopted. However, in this conventional method, the efficiency of the forming process is not expected to be improved, and when a hard material that is difficult to cut and the like is used as the overlaying metal material, the overlay metal is substantially However, there was a problem that molding such as flattening was difficult.

Therefore, the present invention solves the drawbacks of the conventional method as described above, is excellent in processing efficiency, and satisfactorily performs predetermined flattening molding, upsetting, etc. even when overlaying a high hardness material. It is an object of the present invention to provide a new surface forming method and a device therefor.

[0004]

In order to solve the above-mentioned problems, the present invention is to build up a metal material consisting of a metal, an alloy or a metal-based composite on the surface of a base material, and locally heat it to apply it. Provided is a surface molding method for a metal material, which is characterized by pressure molding. Further, the present invention provides, as an apparatus for the above method, a metal overlaying means, a heating means for locally heating the overlaid metal material, and a jig means for pressing the locally heated overlay metal material. There is also provided a surface forming apparatus for a metal material, which is characterized by being provided.

Further, in the method and apparatus of the present invention, it is also preferable that a means for high frequency induction heating or a heating means by direct energization is adopted for local heating.

[0006]

According to the present invention, after the metal material is overlaid, it is locally heated and pressed to enable flattening and upsetting of the overlaid metal material. For this reason, it is possible to efficiently perform the forming process without adopting a processing means such as cutting as in the past. Moreover, the surface molding can be satisfactorily performed even in the case of a hard material, which is difficult to mold by the conventional method.

Hereinafter, the present invention will be described in more detail with reference to examples. Of course, the present invention is not limited to the following examples, and the target metal material may be a metal, an alloy, or a metal-based composite material as appropriate. It goes without saying that various means can be applied to the detailed structure and shape of the means.

[0008]

Example 1 As illustrated in FIG. 1, upsetting for a built-up portion was performed on a groove portion of a base material. The procedure is as follows. (A) S45C steel is used as the base material (2) having the groove portion (1), and the overlay welding is performed on a predetermined surface of the substrate with a coated arc welding rod for hardfacing (corresponding to JIS DF2B-B) having the composition shown in Table 1. went. The diameter of the welding rod is 4.0 mm, the welding current is 150 A, the preheating temperature and the temperature between passes are 200 ° C.
And

The hardness of the weld overlay (3) was about H _R C50, and it was difficult to form it by a machining method. (B) A predetermined portion of the hardfacing welded portion (3) was locally heated to a temperature of 1000 ° C. or higher using each means of oxygen-acetylene burner, laser beam, and high frequency induction heating.

High frequency induction heating is 50 kw × 400 kH
The condition was z. (C) Immediately after reaching a predetermined temperature, the pressure was applied by a pressure jig (4) to perform upsetting by compression of the build-up welded portion (3). After that, finish grinding was performed. It became possible to perform molding with extremely high efficiency, and the predetermined molding was carried out accurately.

[0011]

[Table 1]

Example 2 In Example 1, local heating of the overlay welding portion (3) was performed as shown in FIG.
Direct energization through the pressing jig (5) as shown in FIG. In this case, energization heating is 40 A / m AC current
It was carried out under the condition of m ² . The pressure jig (5) is a copper alloy electrode material for resistance welding (JIS Z323).
4-3 species) was used. The tensile strength of this material is 70kg
f / mm ² , hardness H _R B 95, conductivity of 50 I.D.
A. C. S. (%, 20 ° C.).

Good molding was possible in the same manner as in Example 1. Example 3 As illustrated in FIG. 3, on the surface of the substrate (2) (SUH3), Stellite No. 3 having the composition shown in Table 2 was used. The 6 (Co-based alloy) powder was used to form the metal overlay (3) by the plasma arc welding method.

Then, an electrode (JIS Z3) as the pressing jig (5) shown in the second embodiment was formed on the metal overlay portion (3).
234-3 type) was brought into contact, an alternating current of 1000 A was applied, and the mixture was heated to a predetermined temperature of 800 ° C. and pressed to perform flattening molding. Good molding efficiency and molding properties were obtained.

[0015]

[Table 2]

Example 4 As illustrated in FIG. 4, Stellite No. 3 was formed on the surface of the substrate (2) (SUH) tubular portion in the same manner as in Example 3. 6
A metal overlay portion (3) of (Co-based alloy) was formed, and an electrode as a pressing jig (5) was inserted while energizing (1000 A). After heating to 800 ° C., this insertion was gradually performed to perform flattening molding. Good molding was possible. Example 5 A substrate (2) having a groove (1) as illustrated in FIG.
(SUH3), Stellite No. The 6 (Co-based alloy) powder was overlay welded using a plasma welding torch (6).
By the high frequency induction heating coil (7) arranged so as to surround the obtained metal overlay (3), 10 kw × 2 MH
While heating under the condition of z, the temperature of the overlay metal is measured by an electrode as a pressing jig (5) having a thermocouple (8) attached to the tip thereof, and a predetermined temperature (800 ° C) is reached. If pressed immediately. By this, flattening of the metal overlay (3),
Upsetting was realized efficiently.

In this case, the high frequency induction heating coil (7)
Was integrated with the pressure jig (5). In addition, this device was also provided with a signal / control device (including CPU, ROM, RAM) (9) for pressing the pressing jig (5) by the temperature from the thermocouple (8). Example 6 As illustrated in FIG. 6, the formed metal overlay portion (3) is heated by direct energization together with a plasma welding torch as overlaying means (10) for overlaying a metal material on the surface of the base material (2). Then, the surface forming apparatus was constituted by the ring-shaped heating / pressurizing means (11) for pressing and pressurizing and pressing.

With this apparatus, it was possible to perform molding in the same manner as in Example 5 and to perform favorable high-efficiency molding. As in Example 5, a thermocouple was attached to the ring-shaped heating / pressurizing means (11).

[0019]

As described in detail above, according to the present invention, even with a hard material, it is possible to perform flattening and upsetting of a built-up metal material with high efficiency and with ease. Further, the grinding of the surface finish after that is also minimal.

[Brief description of drawings]

FIG. 1 is a process perspective view illustrating a method of the present invention.

FIG. 2 is a cross-sectional view illustrating a method of direct electric heating.

FIG. 3 is a determined side view illustrating a method of direct electric heating.

FIG. 4 is a cross-sectional view exemplifying a pipe forming method by direct energization.

FIG. 5 is a cross-sectional view illustrating a method of high frequency induction heating.

FIG. 6 is a perspective view of a main part illustrating an apparatus for a direct electric heating method.

[Explanation of symbols]

 1 Groove 2 Base Material 3 Metal Overlay 4 Pressurizing Jig 5 Pressurizing Jig (Electrode) 6 Plasma Welding Torch 7 High Frequency Induction Heating Coil 8 Thermocouple 9 Signal / Control Device 10 Overlay Means 11 Heating / Pressing means

Claims (7)

[Claims] 1. A surface forming method for a metal material, which comprises depositing a metal material made of a metal, an alloy or a metal-based composite on a surface of a base material, and locally heating the metal material for pressure molding. 2. The surface molding method according to claim 1, wherein local heating is performed by high frequency induction heating. 3. The surface molding method according to claim 1, wherein the local heating is performed by directly energizing. 4. The local heating and the pressurizing are simultaneously performed.
Surface molding method. 5. A locally heated meat together with a metal overlaying means for overlaying a metal material composed of a metal, an alloy or a metal matrix composite on the surface of a substrate, and a heating means for locally heating the overlaying metal material. A surface forming apparatus for a metal material, comprising a jig means for pressing the metal material. 6. The surface forming apparatus according to claim 5, wherein the heating means is a high frequency induction heating coil. 7. The surface forming apparatus according to claim 5, wherein the pressing jig means is a direct heating means as a heating means for local heating.